(57) In a method of detecting a data error in a finite element meshing diagram in which
an analytic model is meshed into finite elements, the number of elements having each
of boundaries of elements surrounding a node as their own boundaries is counted respectively
to check whether the node is positioned inside or on an outer circumference of an
element meshing diagram. By using this position information, data error detection
is performed for the element meshing diagram. When one side, face, or element is regarded
as a segment and this segment is to be extracted from a finite element meshing model,
an index value characterizing the combination of nodes constituting each segment is
assigned to the segment. A segment list is formed by consecutively arranging pieces
of information of segments having the same index value. An index table showing the
relationship between the index values and the positions in the segment list also is
formed. On the basis of the segment list and the index table, segments having the
same index value are extracted to obtain node information. A free face is extracted
from an element by checking, for all faces of the element, whether a face of the element
is shared by another element. Whether two faces having one side of the element as
their own sides are free faces is checked. If both of the two faces are free faces,
it is determined that the side is a contour. Whether a side having one node of each
element as its own end point is a contour is checked. If all of the sides are contours,
it is determined that the node is a vertex.
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